ALBERTOSAURUS SARCOPHAGUS Osborn, 1905

synonyms— Laelaps incrassatus, Dryptosaurus incrassatus

type— NMC 6500

time—latest Campanian to early Maastrichtian of the late Late Cretaceous

horizon and distribution—Horseshoe Canyon Formation of Alberta

As I said above, this and the other Horseshoe Canyon tyrannosaur A. arctunguis are real headaches. The type of this species is a partial, badly preserved skull, not enough to really tell us what kind of animal it is. Hopefully better remains will eventually help better define the species. Until then about all we can say is that it appears to be more heavily constructed than A. arctunguis. Just how closely related this species is to the other albertosaurs is not clear either.